Right now
The most recent data we hold from NOAA arrived 8 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 19 May 2026 at 02:00 UTC. It is kept here as a record.
It is the 2nd strongest of the 70 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued May 18 at 5:06PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO
An estimated 1,281,172 people live within 50 km of this point.
Nearby, since 15 March 2026
- May 18, 2026 · score 52 · 2.4 km
- May 19, 2026 · score 52 · 4.6 km
- March 16, 2026 · score 52 · 6.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 38.5182, -90.3883 |
| Nearest City | Concord (2 km) |
| Population Exposed | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-18T22:06:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.c4697f6a33e133f80b4ed71f28e56bec |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Clinton, IL; Madison, IL; Monroe, IL; St. Clair, IL; Jefferson, MO; St. Louis, MO; St. Louis City, MO; Franklin, MO; Gasconade, MO; Warren, MO; Benton, MO; Camden, MO; Hickory, MO; Miller, MO; Morgan, MO and 6 more areas |
| Headline | Flash Flood Warning issued May 18 at 5:06PM CDT until May 18 at 9:00PM CDT by NWS St Louis MO |
| Expires | 2026-05-18T21:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 9 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c4697f6a33e133f80b4ed71f28e56becbf43c778.001.1","noaa_urn:oid:2.49.0.1.840.0.cff640bd9ce78b5b5ff4f9a808c4ea0c0d79e656.001.1","noaa_urn:oid:2.49.0.1.840.0.3658fe385d81f49864c59545aa948e911a18fecb.001.1","noaa_urn:oid:2.49.0.1.840.0.a0b4bb08bb54824db9b53609810c714f7249c990.001.1","noaa_urn:oid:2.49.0.1.840.0.c80b4e429257b3792218c6e020108ce1342b51d9.001.1","noaa_urn:oid:2.49.0.1.840.0.e3af18ef65f13c8f2f4cf32e0021e124f57ea286.001.1","noaa_urn:oid:2.49.0.1.840.0.dbabff3a536120a3ca09dab0ff473b6cc62da205.002.1","noaa_urn:oid:2.49.0.1.840.0.f51d25858704af1517e0bba1e5bf5148f039ac5f.001.1","noaa_urn:oid:2.49.0.1.840.0.981763280e670dafdad02306926ecdd4a788a568.001.1"] |
| Iem TypeSummary | R |
| Iem Magnitude | 2.03 |
| Iem Unit | Inch |
| Iem City | Ferguson |
| Iem County | St. Louis |
| Iem State | MO |
| Iem Wfo | LSX |
| MergedSources | [{"id":"iem_R_38.800_-91.140_1779134160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779134160000,"latitude":38.8,"longitude":-91.14},{"id":"iem_R_38.740_-90.300_1779140400000","source":"iem","severity":"low","severityValue":25,"timestamp":1779140400000,"latitude":38.74,"longitude":-90.3}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Concord?
Calamity.live data shows a weather event with CalamityScore 52/100, near Concord (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.